Burglar-alarm.



C. G. MUNSELL. BURGLAR ALARM. APPLIOATION FILED AUG. 15. 1907.

91 3,669'. Patented Feb. 23, 1909.

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.forced into a suitable recess formed in the UNITED STATES PATENT OEFTOE.

CHARLES GARDNER MUNSELL, OF SIDNEY, IOWA, ASSIGNOR OF TWO-THIRDS TO ALFRED W. HAWVER, OF SPRINGFIELD, MISSOURI.

BURGLAR-ALARM.

Speccaton of Letters Patent.

Patented Feb. 23, 1909.

Application led August 15, 1907. Serial No. 388,635.

To all whom it may concern:

Be it known that I, CHARLES G. MUNSELL, a citizen of the United States, residing at Sidney, in the county of Fremont and State of Iowa, have invented a new and useful Improvement in Burglar-Alarms, of which the following is a specification.

This invention relates to improvements in means for detecting and announcing surreptitious or other attempts at opening, or in any way interfering with, the doors, windows or other passages protected by said means, and the objectof this invention is to provide means which may be readily attached to doors and windows and automatically operable upon disturbance thereof to sound an alarm.

Iiy invention will be more readily understood by reference to the accompanying drawings forming` a part of this specification and in which- Figure l is a detail view of a part of window frame and window partly broken away, showing` the circuit breaker in open position, and Fig'. 2 is a similar view showing the circuit. breaker in closed position.

In carrying; out my invention I employ a closed circuit. and in this interpose the circuit breakers, the breaking' of which causes the alarm to sound. 9 indicates the wires of the circuit which are connected to the circuit breakers forming; part of the burglar alarm system. The circuit breakers are applied to a door or window frame l0, consisting in either ease of plate l1, adapted to be inserted in the wood work forming the stile or jamb of the window or door and secured therein by screws or other suitable means. Freely fitting in a central circular opening in the plat-e Il is a button shaped member 19.. having' a rounded exterior adapted to contactl with an opposingl body, as the sash of a window or the edge of a door, and be framing thereof, against the pressure of a `flat spring 13, which has the normal effect l of keeping the button l2 in an outwardly eX- tending position. The spring` 13 is made so as to surround the reduced portion 14 of the button l2, and is provided with a projection 15, limiting its outward motion; and a point 1G on t-he inner side ot the button l2 which makes contact against and forms a circuit with the insulated spring plate 1T when the button l) is depressed..

The current may pass through any number of the above described buttons.

In operation, if a door or window be opened, permitting the contact between the point i6 and the spring plate 17 to become 60 separated or if the window be raised so that the button l2 recedes from the. place 1T, the.

c' cuit is broken and the alarm sounded.

laying thus described my invention. what I claim as new and desire to secure by Letters Patent is:

rhe combination with a closed circuit alarm system, of a circuit breaker adapted to be arranged in a recess formed in the frame of a door or window comprising` a ilat springl 70 plate secured to the bottom of said recess having a strip of ii'isulating' material arranged ver a portion of its outer face, an apertured plate secured over said recess inclosing the same, a springv plate secured to the under side of said plate within the recess, said plate beingI provided with an enlarged apertured end extending` across the aperture of the plate, and a button secured in the aperture of the spring extending out- S0 through the aperture of the plate for normally holding said enlargement into engagement with the uninsulated portion of said spring plate when under pressure.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES GA RDN ER UUNSELL. 

